Cart jack with clamping plates adapted to adopt an inclined position relative to theram



June 5, 1934.

E. BRA LMANN 1,952,000 CART JACK WITH CLAMPIN LATES ADAPTED TO ADOPT ANINCLINED POSITION RELATIVE TO THE RAM Filed Jan. 8, 1932 g ln enlonPatented June 5, 1934 oan'r JACK wrrn' ADAPTED TO ADOPT AN TION RELATIVETO PATENT OFFICE CLAMPING P L A '1 E S INCLIN ED POSI- THE RAM EugenBraselman'n, Delle, near Breckerfeld,

Germany Application January 8, 1932," Serial No. 585,579

In Germany January 15, 1931 2 Claims. (01; 254-106) I have filedapplication in Germany on January 15, 1931. I

This invention relates to a cart jack, the ram of which is lifted andheld by two plates adapted 5 to adopt an inclined position relative tothe ram, one of said plates adapted to be lifted by means of a liftingcam or lever and the other being unable to follow the cam movement andserving as holding device. These clamping plates are so recessed, thatan imaginary line between their. outermost clamping points extendssubstantially perpendicular to the axis of the ram.

According to the invention the clamping plates are flat plates, and theaperture for the passage of the ram is cut out on the diametricallyopposite points of the upper si such a distance, that the connectinglines of the outermost clamping po ts thus formed are againapproximately perpendicular to the axis of the ram. Thus, it is possibleto give to the curved ends of the cut out portions or extensions of the4 desired steep inclination the diametrical cutout portions, caused bythe recessing of the clamping plates and occurring on both sides of theimaginary line connecting the two outermost clamping points, can beincreased so that the clamping plates, in assummg an inclined position,wedge more rapidly and reliably against the ram.

"An embodiment of the invention is illustrated by way of example in theaccompanying drawing, in which:--

Fig. 1 shows in side elevation partly in section a jack fitted with theimproved clamping plates. Fig. 2 is a longitudinal section of the jacktaken atright angles to Fig. 1.

Fig. 3 showsa clamping plate in side elevation 49 partly in section.

Fig. 4' is a top plan view of Fig. 3.

The ram 1 of the jack is guided in an upright 2. A clampingplate 3,adapted to assume an inclined position relative to the ram, is adaptedto be lifted by a cam 4 actuated by means .of a hand lever, and liftsthe ram but, in descending, slides idly over the surface of the ram. Theholding of the raised ram is effected by a second clamping plate 5,which is mounted at one .side

50 in the upright of the jack. By lifting this clamp ing plate 5 the ram1 is lowered.

The clamping plates 3 and 5, as shown in Figs. 3 and 4, are cut out ontheir upper and lower sides at diagrammatically opposite points so thatthe two cut out portions together have approximately the height of theclamping. plate. The cut out portions may also be of different depths.Consequently the imaginary line between the outermost clamping points aand b of the plates is approximately perpendicular to the'longitue andlower side to dinal axis of the ram. These cut out portions extend intothe passage aperture of each clamping plate on the lines c and d, whichare inclined to the axis of the ram. These lines 0 and d correspond to abend in the clamping plate but, according to the constructionillustrated in Figs. 3 and 4, they can extend steeper than in a reclosedclamping plate. By the term reclosed clamping plate is meant a platewith a bent or crank-like formation similar to that shown in applicantsPatent No. 1,824,768 granted Sept. 19, 1931. As the clamping plateassumes an inclinedposition, during which it oscillates around theoutermost clamping point a or b, the lateral clamping of the ram onthecurved lines 0 and d is increased as desired, independently of theposition of the outermost clamping points a. and b.

I claim:-

1. A vehicle jack having a base member provided with a vertical opening,a. ram vertically movable in said opening, a flat latch plate having anopening through which said ram passes, means for supporting said plateat one edge to permit the plate to tilt with the supporting means as afulcrum, the said plate having its upper surface beveled downwardly tosaid opening on the side of the ram adjacent the supporting means andhaving its under surface beveled upwardly to the opening on the oppositeside of the ram, a similar flat operating plate provided with an openingthrough which the ram passes and having similar beveled surfaces, and anoperating lever pivoted to the base member and engaging beneath thatside of the operating plate having its upper surfacebeveled, thesurfaces of the openings opposite the bevels being segmento-cylindrical.

2. A vehicle jack having a base member provided with a vertical opening,a ram vertically movable in said opening, a flat latch plate having anopening throughwhich said ram passes, means for supporting said plate atone edge to permit the plate to tilt with the supporting means as afulcrum, the said plate having its upper surface beveled downwardly tosaid opening on the side of the ram adjacent the supporting means andhaving its under surface beveled upwardly to the opening on the oppositeside of the ram, a similar flat operating plate provided with an openingthrough which the ram passes and having similar beveled surfaces, and anoperating lever pivoted to the base member and engaging beneath thatside of the operating plate having its upper surface beveled, thesurfaces of the openings opposite the bevels being segmentocylindrical,said beveled surfaces each extending substantially half way around saidram and each bevel gradually increasing in depth from its ends to itsmiddle portion and the beveled surfaces of each plate being parallel toeach other.

. EUGEN BRASELMANN.

